A reader sent in this video he shot of a dramatic scene on the L train in Brooklyn last night. Here's how he set it up—

The guy in black apparently groped the lady in the orange shirt. He jumped into the train as the doors were closing, but the woman and her friend held up the train and yelled at the guy to get off the train and wait for the cops. When it was clear we wouldn't [be] going anywhere until this got straightened out, some people started to come to her aid.